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CVE Record

CVE-2020-26078: Cisco IoT Field Network Director File Overwrite Vulnerability

A vulnerability in the file system of Cisco IoT Field Network Director (FND) could allow an authenticated, remote attacker to overwrite files on an affected system. The vulnerability is due to insufficient file system protections. An attacker could exploit this vulnerability by crafting API requests and sending them to an affected system. A successful exploit could allow the attacker to overwrite files on an affected system.

MediumCVSS 4.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Cisco IoT Field Network Director has a file overwrite weakness. A logged-in attacker with high privileges could abuse the system to change files on the server. The business concern is integrity of a network management platform, not broad unauthenticated compromise.

Executive priority

Handle as a moderate-priority infrastructure management risk. Escalate if IoT-FND supports critical field, utility, or operational networks, because unauthorized file changes can undermine platform trust.

Technical view

CVE-2020-26078 is a CWE-73 issue in Cisco IoT-FND file system protections. The source states an authenticated remote attacker can send crafted API requests to overwrite files. CVSS 3.0 is 4.9: network reachable, low complexity, high privileges required, integrity impact high.

Likely exposure

Exposure is limited to organizations running Cisco IoT Field Network Director. Risk is higher where administrative or API access is reachable from broad networks. The bundle does not provide affected version ranges.

Exploitation context

The provided sources support remote authenticated exploitation via API requests, but not public exploitation or active attacks. The CVE is not marked KEV in the bundle, so active exploitation is not evidenced here.

Researcher notes

Evidence is limited to the CVE record and Cisco advisory reference in the bundle. No affected version list, patch detail, workaround text, or exploitation telemetry is included here.

Mitigation direction

  • Check Cisco's advisory for affected releases, fixed releases, and any documented workarounds.
  • Restrict IoT-FND administrative and API access to trusted management networks.
  • Review privileged IoT-FND accounts and remove unnecessary access.
  • Monitor IoT-FND hosts for unexpected file changes.

Validation and detection

  • Confirm whether Cisco IoT Field Network Director is deployed.
  • Inventory IoT-FND versions and compare them with Cisco advisory guidance.
  • Review which users have high-privilege access to IoT-FND.
  • Check host integrity and logs for unexpected file overwrite activity.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-73: File access and web shell behavior lookup

File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-26078 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.9 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.9CVSS 3.0MediumCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N1.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

4.9Medium
CVSS 3.0 vector shape for CVE-2020-26078Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco IoT Field Network Director (IoT-FND)n/aListed
Weakness

CWE details

CWE-73

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-73 · source CWE mapping

External Control of File Name or Path

External Control of File Name or Path represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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